Icelandic Sign Language (Icelandic: íslenskt táknmál) is the sign language of the deaf community in Iceland. It is based on Danish Sign Language; until 1910, deaf Icelandic people were sent to school in Denmark, but the languages have diverged since then.

It is officially recognized by the state and regulated by a national committee.

Icelandic Sign Language is distinct from spoken Icelandic; in 1999, the Icelandic Ministry of Education stated that, in the Icelandic basic curriculum, Icelandic Sign Language is the first language of deaf people, while spoken Icelandic is a second language.

Therefore, deaf Icelanders should learn Icelandic Sign Language as their first language and Icelandic as their second language.